WO2015131029A1 - Encres et revêtements durcissables par rayonnement contenant du diacétone acrylamide - Google Patents

Encres et revêtements durcissables par rayonnement contenant du diacétone acrylamide Download PDF

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Publication number
WO2015131029A1
WO2015131029A1 PCT/US2015/017956 US2015017956W WO2015131029A1 WO 2015131029 A1 WO2015131029 A1 WO 2015131029A1 US 2015017956 W US2015017956 W US 2015017956W WO 2015131029 A1 WO2015131029 A1 WO 2015131029A1
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composition
acrylate
blends
acrylamide
ink
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PCT/US2015/017956
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English (en)
Inventor
Clive Edward Lawrence
Shaun Herlihy
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Sun Chemical Corporation
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Application filed by Sun Chemical Corporation filed Critical Sun Chemical Corporation
Priority to EP15754553.4A priority Critical patent/EP3110564A4/fr
Priority to US15/117,066 priority patent/US20160340529A1/en
Publication of WO2015131029A1 publication Critical patent/WO2015131029A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/10—Printing inks based on artificial resins
    • C09D11/106—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C09D11/107—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds from unsaturated acids or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/46—Polymerisation initiated by wave energy or particle radiation
    • C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
    • C08F2/50—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light with sensitising agents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/10—Printing inks based on artificial resins
    • C09D11/101—Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/10—Printing inks based on artificial resins
    • C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
    • C09D11/103—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds of aldehydes, e.g. phenol-formaldehyde resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/10—Printing inks based on artificial resins
    • C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
    • C09D11/104—Polyesters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/32—Inkjet printing inks characterised by colouring agents
    • C09D11/322—Pigment inks
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/36—Inkjet printing inks based on non-aqueous solvents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes

Definitions

  • the present invention is directed to radiation curable ink and coating compositions that have good cure speed, conversion, and cured film hardness.
  • the inks and coatings of the invention show a reduced tendency for substrate embrittlement, ink film softening, or loss of adhesion when applied in multiple layers.
  • the inks and coatings of the invention also have good flexibility and extensibility.
  • the energy curable inks and coatings show a reduced tendency to thermally yellow or change on storage, reduced unpleasant odor, and less swelling of printing components, such as squeegee rubbers used in screen printing.
  • compositions may be applied using various print presses/machines, onto to a variety of substrates to fulfill many different market requirements.
  • Printing compositions may be formulated containing mainly multi-functional monomers, with multi-substrate adhesion and fast curing properties, however, they may embrittle plastic substrates and are not extensible at room or elevated temperatures.
  • Alternative formulations low in functionality may be insufficiently reactive when exposed to radiation, producing soft films, particularly in multilayer applications.
  • the properties of N-vinyl caprolactam are unusual in producing fast curing films with reduced tendency to the above problems.
  • These compositions, based on N- vinyl caprolactam are capable of adhesion to a range of substrates, while retaining impact resistance, extensibility and adhesion of multi-layer prints.
  • N-vinyl caprolactam is undesirable, due to toxicological concerns and product labeling.
  • the tertiary acrylamide monomer N-acryloyl morpholine (ACMO) has been used as an alternative, but above 10% it carries similar labeling to N-vinyl caprolactam, it is a severe eye irritant with limitations on its global registration.
  • Radiation curable coatings may embrittle plastic substrates, via a crack propagation mechanism, where a crack initiated in the more brittle coating propagates across the boundary to the underlying substrate. The reduction in impact resistance depends critically on the nature and thickness of the radiation cured coating and the nature and thickness of the underlying plastic.
  • Some formulators have tried to improve substrate adhesion and plasticize ink films by the inclusion of solvents and/or non-reactive plasticizers in printing compositions, which may give rise to flash-point problems and film softening due to the presence of unreacted materials. This softening is particularly apparent in multi-layer prints.
  • the printing compositions described herein are preferably free of these additives.
  • Radiation curable coating or printing compositions may be yellowed by included components or on exposure. Some photoinitiators are initially yellow and on exposure and aging may darken further. Other initiators have much lower yellowing when exposed to radiation (UV light), but may yellow on ageing at ambient or elevated temperature due to thermal oxidation of breakdown products. Monomers and oligomers may also yellow on exposure to radiation, both initially, and thermally on storage. Thermal processes may also darken compositions on storage in the pot. Aged samples, when printed, cured, and stored, have an increased tendency to yellow. Yellowing is very important and undesirable in whites, varnishes, light colors and process inks. Ink or coating compositions would preferably have a long shelf life of 12 months or greater, and formulations containing N-vinyl caprolactam show considerable yellowing when stored at ambient conditions. The yellowing is also important in outdoor applications where lifetime may be reduced.
  • Automotive and membrane switch printed parts may have a very long working life up to and above 10 years, and to simulate these conditions, the coatings must survive extended accelerated testing, for example 7 days at 105°C.
  • N-vinyl caprolactam is a solid at room temperature and needs to be melted for incorporation, and is therefore often stored at elevated temperature. It has a strong tendency to yellow or brown on aging and also yellows on exposure to radiation and subsequent storage at room temperature or above. It is very difficult to prevent these problems even with thermal stabilizers.
  • the printing composition is squeezed through the mesh by the squeegee.
  • Components of the printing composition both monomers and initiators, may individually or combined cause various types of squeegee rubbers to swell. Different grades and types have varying susceptibility to swelling and damage. The swelling may cause print defects like streaking, and, in extreme cases, small pieces may break off, damaging the mesh. Combinations of components may worsen or lessen squeegee attack.
  • Monofunctional monomers like N-vinyl caprolactam, tetrahydrofurfuryl acrylate, and acrylol morpholine are particularly bad and their concentration may be limited by the severity of the effect.
  • WO 2006/041004 discloses UV curable inkjet compositions that comprising an acrylamide with trifunctional or higher acrylate monomers. Preferred compounds are typically tertiary acrylamides such as ⁇ , ⁇ '-dialkylamino acrylamides or ACMO.
  • EP 2644664 provides an actinic radiation curable type composition for use in an in- mold molded article, including an inkjet recording method, decorative sheet, decorative sheet molded product, a process for producing an in-mold molded article, and an in-mold molded article.
  • the composition includes at a minimum an oligomer, an acrylamide derivative, and an N-vinyl compound.
  • the document describes N- vinyl lactams, particularly N- vinylcaprolactam (NVC), as preferred components of the composition.
  • NVC has a relatively high odor on cure and a poor toxicological profile.
  • the examples include formulations that contain high levels of N-vinyl caprolactam and 2-ethoxyethoxyethyl acrylate (EOEOEA), which carry adverse product labeling, and high levels of the monomer dicyclopentanyl methacrylate (Fancryl FA-513M), which has a very unpleasant odor.
  • EEOEA N-vinyl caprolactam and 2-ethoxyethoxyethyl acrylate
  • Fancryl FA-513M monomer dicyclopentanyl methacrylate
  • EP 2302007 is directed to ink compositions that include photoinitiators containing a 4-thiophenyl substituted benzophenone group within the structure.
  • polymerizable compounds that can be used in the formulation include acrylamides
  • NVC is the preferred compound.
  • Compounds of the examples contain high levels of NVC, EOEOEA, tetrahydrofurfuryl acrylate (THFA), or dicyclopentenyloxyethyl acrylate (Fancryl FA-512A), all of which have an extremely unpleasant odor and/or carry adverse toxicological labeling.
  • EP 250622 describes ink compositions comprising acrylamides.
  • the document defines a series of multi-functional acrylamides (including diacetone acrylamide) which can be used in conjunction with other acrylamides.
  • the patent is directed to water- dilutable formulations, with water being a necessary part of the formulation. There are no options for using acrylate monomers within the chemistry described in the application.
  • US 7,297.460 describes inkjet inks that contain polyhedral oligomeric silesquioxane (POSS), optionally substituted with secondary acrylamide or methacrylamide functional groups.
  • POSS polyhedral oligomeric silesquioxane
  • the description does not refer to the use of low molecular weight acrylamides. All acrylamide compounds described are acrylamide functional POSS.
  • EP 0337705 describes screen printing inks consisting of a water soluble radiation curable component, a photoinitiator and/or a photochemical crosslinking agent, a pigment and/or a water soluble dye, and an ionic, non-radiation curable thickener.
  • VP is used as a water-soluble unsaturated monomer in the working examples.
  • the document describes inks that have high screen stability without compromising cure speed, combined with a low printed film weight comparable to solvent based inks.
  • the inks of EP 0337705 must contain 20-80 wt% water at the time of printing. If made in concentrated form, they must be diluted with water prior to use for printing.
  • US 4,789,621 discloses emulsions used to coat screens for screen printing. After application to the screen, to form a film covering all of the mesh holes, a blocking material (i.e. stencil) is placed on the emulsion film in the non- image areas to be printed. The emulsion is cured, blocking the screen holes in the screen mesh so that in the cured areas, no ink can penetrate.
  • the emulsions are based on polyvinyl alcohol, and polyvinyl acetate or polyvinyl acetate copolymers, to which are added diacetone acrylamide and acrylic monomers. Di- or higher functional acrylic monomers are preferred.
  • the emulsions are water-based, allowing for easy removal of the non-cured portions of the emulsion to produce the pattern on the screen mesh through which ink will be applied to the substrate.
  • the viscosity of the emulsions is 20,000 to 30,000 cps (i.e. 20 to 30 Pa s) at 25°C, and are therefore not suitable as inks.
  • JP 59054600 and JP 50036204 provide water-based resin compositions for the preparation of printing plates (photosensitive and flexographic).
  • WO 2010/150,023 discloses a UV ink that is curable by exposing the ink to UV radiation from an LED source, followed by UV radiation from a flash lamp.
  • the application describes a UV ink that contains an N- vinyl amide or an acrylamide (N-acryloyl amides), and defines ACMO as preferred.
  • the working examples contain only NVC as an amide compound of this type.
  • WO 2008/093071 describes the use of cyclic monofunctional acrylate monomers in inkjet ink. Reference is made to the use of N-vinyl amides and acrylamides (N-acryloyl amides), and defines ACMO as the preferred example. No acrylamide monomers of any kind are supported by practical examples.
  • WO 2008/1 17,092 discloses use of an inkjet formulation that is resistant to blocking on a reel.
  • N-vinyl caprolactam has recently changed hazard classification, and, by agreement with EuPIA, Sun Chemical is obliged to remove this material from formulations.
  • NVC N-vinyl caprolactam
  • ACMO ACMO
  • Prior art inks and coatings may have good performance on some of the desired properties. But each, while being good in some properties, lack in others. Thus, there is a need to provide radiation curable inks and coatings that avoid the use of disfavored components such as NVC, while still maintaining desirable properties, particularly when used in multi-layer builds.
  • the present invention provides radiation curable ink or coating compositions that are very effective in providing fast curing, impact resistance, extensibility, thermal/storage stability with respect to yellowing and odor, free from VOC solvents, and also have excellent adhesion properties.
  • the compositions of the invention comprise an acrylamide material, preferably diacetone acrylamide.
  • the present invention provides a radiation curable printing ink or coating composition comprising:
  • composition contains a maximum of 5% wt. N-vinyl compounds; and wherein the composition contains no N-vinyl caprolactam, N-vinyl pyrrolidone, or N- acryloyl morpholine.
  • the majority of the acrylamide material present in the composition is diacetone acrylamide.
  • all of the acrylamide material present in the composition is diacetone acrylamide.
  • the composition contains no N-vinyl compounds.
  • the additional monofunctional acrylate or methacrylate monomer comprises a cyclic mono-functional (meth)acrylate, with the cyclic radical being either saturated or unsaturated, including aromatic.
  • the additional monofunctional acrylate or methacrylate monomer is selected from the group consisting of phenoxyethyl acrylate (PEA), cyclic TMP formal acrylate (CTFA), isobornyl acrylate (IBOA), i-butyl cyclohexyl acrylate, 3,3,5- trimethyl cyclohexyl acrylate, tetrahydro-furfuryl acrylate (THFA), or mixtures thereof.
  • PDA phenoxyethyl acrylate
  • CCTFA cyclic TMP formal acrylate
  • IBOA isobornyl acrylate
  • i-butyl cyclohexyl acrylate 3,3,5- trimethyl cyclohexyl acrylate
  • THFA tetrahydro-furfuryl acrylate
  • the composition contains no added water.
  • the composition contains monofunctional monomers in an amount of 1-45% wt.
  • the composition contains difunctional or higher monomers in an amount of 0-15% wt.
  • the composition contains a photoinitiator in an amount of 0.1-20% wt.
  • the acrylamide material is present an amount of 1-40% wt.
  • the acrylamide material is present in an amount of 1-30% wt.
  • the acrylamide material is present in an amount of 1-20% wt.
  • the acrylamide material is present in an amount of 1-10% wt.
  • the acrylamide material is present in an amount of 1-5% wt.
  • the composition further comprises a colorant or filler.
  • the composition further comprises one or more additives selected from the group consisting of stabilizers, surfactants, defoamers, slip additives, waxes, wetting additives and synergists.
  • the composition is a screen printable ink or coating, and is suitable for flat-bed or rotary screen printing.
  • the composition that is a screen printable ink or coating suitable for flat-bed or rotary screen printing has a viscosity in the range 0.2-2.5 Pa s, measured on a cone and plate viscometer at 25°C.
  • the composition is a flexographic ink or coating.
  • the composition that is a flexographic ink or coating has a viscosity in the range 0.2-1.0 Pa s, measured on a cone and plate viscometer at 25°C.
  • the composition is a gravure, pad or spray ink or coating.
  • the composition that is a gravure, pad or spray ink or coating has a viscosity in the range 0.01-0.2 Pas measured on a cone and plate viscometer at 25°C.
  • the radiation curable printing/coating composition when cured, is impact resistant, extensible, and has good adhesion to a range of substrates, as well as previously printed layers of the composition when printed in multiple layers.
  • the radiation curable printing/coating composition has good storage stability with respect to yellowing and odor generation.
  • the radiation curable printing ink or coating composition causes little or no swelling of ink printing components, particularly rubber squeegees, plates, rollers etc.
  • the present invention provides a method of making an energy curable printing ink or coating composition comprising mixing:
  • composition contains a maximum of 5% wt. N-vinyl compounds; and wherein the composition contains no N-vinyl caprolactam, N-vinyl pyrrolidone, or N- acryloyl morpholine.
  • the present invention provides a printed article comprising the radiation curable ink or coating composition as described above.
  • Diacetone acrylamide is an alternative material found which gives fast curing as part of monofunctional monomer containing printing/coating compositions. Unlike many acrylamide compounds, it also has very favorable toxicology and a low hazard classification based on toxicology from its widespread commercial use in water-based emulsion polymer formulations.
  • Compositions of the invention comprising diacetone acrylamide are fast radiation curing compositions, capable of multi-layer build without substrate embrittlement or adhesion failure. Additionally, these compositions exhibit low ultraviolet (UV), thermal and UV thermally induced yellowing, in can or on print storage, combined with low initial and aged odor development.
  • the terms “comprises” and/or “comprising” specify the presence of the stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Furthermore, to the extent that the terms “includes,” “having,” “has,” “with,” “composed,” “comprised” or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term “comprising.”
  • ranges and amounts can be expressed as “about” a particular value or range. “About” is intended to also include the exact amount. Hence “about 5 percent” means “about 5 percent” and also “5 percent.” “About” means within typical experimental error for the application or purpose intended.
  • the term "monofunctional acrylate monomer” refers to a monomer containing one functional acrylate group.
  • multifunctional acrylate monomer refers to a monomer having two or more functional acrylate groups.
  • difunctional acrylate monomer refers to a monomer containing two functional acrylate groups.
  • trifunctional acrylate monomer refers to a monomer containing three functional acrylate groups.
  • the term "or higher" when referring to an acrylate monomer means a monomer containing greater than three functional acrylate groups.
  • (meth)acrylate or “(meth)acrylic acid” include both acrylate and methacrylate compounds.
  • the present invention provides a radiation curable printing ink or coating composition comprising:
  • composition contains a maximum of 5% wt. N-vinyl compounds; and wherein the composition contains no N-vinyl caprolactam, N-vinyl pyrrolidone, or N- acryloyl morpholine.
  • the present invention a method of making an energy curable printing ink or coating composition comprising mixing:
  • composition contains a maximum of 5% wt. N-vinyl compounds; and wherein the composition contains no N-vinyl caprolactam, N-vinyl pyrrolidone, or N- acryloyl morpholine.
  • the inclusion of the monomer diacetone acrylamide provides fast radiation curing printing compositions capable of multi-layer build without substrate embrittlement or adhesion failure. Additionally, these compositions exhibit low ultraviolet (UV), thermal and UV thermally induced yellowing, in can or on print storage, combined with low initial and aged odor development. It also exhibits reduced swelling of print application components like squeegees compared with other monomers like N-vinyl caprolactam, N-acryloyl morpholine and tetrahydrofurfuryl acrylate. These properties make it a suitable alternative to N- vinylcaprolactam, with superior properties outlined above, and with improved health and safety and EuPIA compliance.
  • UV ultraviolet
  • thermal and UV thermally induced yellowing in can or on print storage, combined with low initial and aged odor development. It also exhibits reduced swelling of print application components like squeegees compared with other monomers like N-vinyl caprolactam, N-acryloyl morpholine and tetrahydr
  • the properties of solid monomers like diacetone acrylamide are hard to predict or measure, as they have to be tested in blends with other monomers, which may or may not be stable. There are predictive models for solvents and solvent blends, but not for monomer, initiators, oligomers and their mixtures.
  • Diacetone acrylamide has unique properties amongst the acrylamides, which are not predictable from its chemical structure.
  • the present inventors discovered that the monomer diacetone acrylamide is capable of similar properties to NVC when incorporated into printing compositions, with the advantage of good thermal and storage stability with respect to yellowing and odor, coupled with low levels of print application component swelling, particularly screen printing squeegees.
  • Radiation curable printing compositions containing diacetone acrylamide may be applied by a number of processes to the substrate materials.
  • the compositions must vary in viscosity and rheology in order to apply evenly and properly to these substrates during the printing process.
  • Examples of the printing processes include screen printing (flat-bed, cylinder and rotary), flexographic and gravure. This is not a complete possible list and by suitable adjustments other coating/printing methods may be possible.
  • Typical viscosities for screen printing measured on a cone and plate viscometer at 25°C are in the range 0.5-2.5 Pas; flexographic 0.2-0.6 Pas; gravure 0.05-0.15 Pas; and coating/spraying 0.01-1.0 Pas.
  • the printing compositions of the present invention containing diacetone acrylamide provide not only a viable replacement for N-vinyl caprolactam in terms of cure speed, adhesion, impact resistance and extensibility, but have low thermal and radiation cured/ thermal yellowing, low initial and aged odor, and low print component swelling, particularly squeegees and flexographic plates.
  • the energy curable printing compositions of the present invention show a reduced tendency for substrate embrittlement, ink film softening or loss of adhesion in multi-layers, by virtue of good cure speed, conversion and cured film hardness. Flexibility and
  • the energy curing compositions show a reduced tendency to thermally yellow or change on storage, decreasing unpleasant odor, and less swelling of printing components, particularly squeegee rubbers.
  • the printing inks/coatings preferably contain 1-40% of an acrylamide material, such as diacetone acrylamide, more preferably 3-25%, and most preferably 5-15% along with other monofunctional or multifunctional acrylate monomers, oligomers, reactive and non- reactive resins and photo-initiators, the selection of which are dependent on the balance of properties being sought.
  • an acrylamide material such as diacetone acrylamide, more preferably 3-25%, and most preferably 5-15% along with other monofunctional or multifunctional acrylate monomers, oligomers, reactive and non- reactive resins and photo-initiators, the selection of which are dependent on the balance of properties being sought.
  • colorants, pigments or dyes may or may not be included, and other non-pigment solid fillers and waxes may also be included.
  • the inks of the present formulation could contain virtually any raw materials that are compatible with energy curable ink systems.
  • Suitable monofunctional ethylenically unsaturated monomers include, but are not limited to, the following: 2-(2-ethoxyethoxy)ethyl acrylate; 2-phenoxyethyl acrylate; 2-phenoxyethyl methacrylate; C 12 -Cwalkyl methacrylate; Ci 6 -Ci 8 alkyl acrylate; Ci 6 -Ci 8 alkyl methacrylate; caprolactone acrylate; cyclic trimethylolpropane formal acrylate; ethoxylated (4) nonyl phenol acrylate; isobornyl acrylate; isobornyl methacrylate; isodecyl acrylate; lauryl acrylate; methoxy polyethylene glycol (350) monomethacrylate; octyldecyl acrylate; polypropylene glycol monomethacrylate; stearyl acrylate; tetrahydrofurfuryl acrylate;
  • Suitable polyfunctional ethylenically unsaturated monomers include, but are not limited to, the following: 1,3 -butyl ene glycol dimethacrylate; 1 ,4-butanediol dimethacrylate; 1,6-hexanediol diacrylate; 1,6-hexanediol dimethacrylate; alkoxylated diacrylate; diethylene glycol dimethacrylate; dipropylene glycol diacrylate; ethoxylated (10) bisphenol-A diacrylate; ethoxylated (2) bisphenol-A dimethacrylate; ethoxylated (3) bisphenol-A diacrylate; ethoxylated (3) bisphenol-A dimethacrylate; ethoxylated (4) bisphenol-A diacrylate; ethoxylated (4) bisphenol-A diacrylate; ethoxylated (4) bisphenol-A dimethacrylate; ethoxylated bisphenol-A dimethacrylate
  • the inventive formulations may also contain oligomers and resins, both reactive and non-reactive (inert).
  • the oligomers could include epoxy acrylates, polyurethane acrylates, polyester acrylates, polyether acrylates and acrylic acrylates, or their methacrylates.
  • the non- reactive (inert) resins could include but are not limited to acrylics, aldehyde, ketone, vinyl, polyester, cellulose derivatives and hydrocarbon resins. This list of additive resins and oligomers is extensive, but not comprehensive, and represents only possible examples. Other examples and combinations remain within the scope and spirit of the invention. These materials may be present in the formulation in the range 0-40%, more frequently 0-20%.
  • Suitable photoinitiators include, but are not limited to, the following: a- hydroxyketones, including, but not limited to, 1-hydroxy-cyclohexyl-phenyl-ketone, 2- hydroxy-2-methyl- 1 -phenyl- 1 -propanone; 2-hydroxy- 1 - ⁇ 4-[4-(2-hydroxy-2-methyl- propionyl)-benzyl]-phenyl ⁇ -2-methyl-propan-l-one; and 2-hydroxy- 1-[4-(2- hydroxyethoxy)phenyl]-2-methyl-l-propanone; acylphosphine oxides including, but not limited to 2,4,6-trimethylbenzoyl-diphenylphosphine oxide; 2,4,6-trimethylbenzoyl-diphenyl phosphinate; and bis-(2,4,6-trimethylbenzoyl)-phenylphosphine oxide; and a-aminoketones including, but not limited to, 2-methyl-methyl-methyl
  • photoinitiators examples include benzyl dimethyl ketal; thioxanthone initiators such as 2-4-diethylthioxanthone, isopropylthioxanthone, 2-chlorothioxanthone, and l-chloro-4-propoxythioxanthone; benzophenone initiators such as benzophenone, 4- phenylbenzophenone, and 4-methylbenzophenone; methyl-2-benzoylbenzoate; 4-benzoyl-4- methyldiphenyl sulphide; phenylglyoxylate initiators such as phenyl glyoxylic acid methyl ester, oxy-phenyl-acetic acid 2-[2-hydroxyl-ethoxy]-ethyl ester, or oxy-phenyl-acetic acid 2- [2-oxo-2-phenyl-acetoxy-ethoxy] -ethyl ester; titanocen radical initiators such as
  • Polymeric photoinitiators are also suitable, including, for example, polymeric aminobenzoates (GENOPOL AB-1 from Rahn, Omnipol ASA from IGM or Speedcure 7040 from Lambson), polymeric benzophenone derivatives (GENOPOL BP- 1 from Rahn, Omnipol BP from IGM or Speedcure 7005 from Lambson), and polymeric thioxanthone derivatives (GENOPOL TX-1 from Rahn, Omnipol TX from IGM or Speedcure 7010 from Lambson).
  • polymeric aminobenzoates GOPOL AB-1 from Rahn, Omnipol ASA from IGM or Speedcure 7040 from Lambson
  • polymeric benzophenone derivatives GENOPOL BP- 1 from Rahn, Omnipol BP from IGM or Speedcure 7005 from Lambson
  • polymeric thioxanthone derivatives GOPOL TX-1 from Rahn, Omnipol TX from IGM or Speedcure 7010 from Lambson
  • An amine synergist may also be included in the ink formulation. Suitable examples include, but are not limited to, the following: ethyl-4-(dimethylamino)benzoate; 2- ethylhexyl-4-(dimethylamino)benzoate; 2-(dimethylamino)ethylbenzoate; poly[oxy(methyl- 1,2-ethanediyl)]; a-[4-(dimethylamino)-a-butoxy; butoxyethyl-4-(dimethylamino)benzoate; plus EBECRYL 80/81/83, EBECRYL LEO 10551/10552/10553, EBECRYL 7100 and EBECRYL PI 16 available from Cytec; CN501, CN503, CN550, CN UVA421, CN341, CN3705, CN3715, CN3735, CN3755, CN381, CN384, CN584, and
  • Defoamers can also optionally be included in the formulation, which prevent the formation of foam during manufacture of the ink, and also while printing.
  • suitable defoamers include TEGO FOAMEX N, FOAMEX 1488, 1495, 3062, 7447, 800, 8030, 805, 8050, 810, 815N, 822, 825, 830, 831, 835, 840, 842, 843, 845, 855, 860, and 883, TEGO FOAMEX K3, TEGO FOAMEX K7/K8 and TEGO TWIN 4000, all available from Evonik. Available from Byk is BYK-066N, 088, 055, 057, 1790, and 020, BYK-A 530, and 067A, and BYK 354.
  • Surface control additives are often optionally used to control the surface tension of the ink, which is required to adjust the wetting of the substrate. They can also be used to control the level of slip and scratch resistance of the coating.
  • suitable surface control additives include but are not limited to TEGO FLOW300, 370, and 425, TEGO GLIDE 100, 110, 130, 406, 410, 411, 415, 420, 432, 435, 440, 482, Al 15, and B1484, TEGO GLIDE ZG 400, TEGO RAD2010, 2011, 2100, 2200N, 2250, 2300, 2500, 2600, 2650, and 2700, TEGO TWIN 4000, and 4100, TEGO WET 240, 250, 260, 265, 270, 280, 500, 505, and 510 and TEGO WET KL245, all available from Evonik.
  • BYK 333 and 337 Available from Byk are BYK 333 and 337, BYK UV3500, BYK 378, 347, and 361, BYK UV3530, and 3570, CERAFLOUR 998 and 996, NANOBYK 3601, 3610, and 3650 and CERMAT 258. Available from Cytec are EBECRYL 350 and 1360, MODAFLOW 9200, and EBECRYL 341. From Sartomer, the aliphatic silicone acrylate CN9800 may be used.
  • the ink compositions of the present invention may optionally contain one or more colorants, including pigments and/or dyes, solid fillers, and solid waxes.
  • suitable organic or inorganic pigments include, but are not limited to, carbon black, zinc oxide, titanium dioxide, phthalocyanine, anthraquinones, perylenes, carbazoles, monoazo and disazobenzimidazoles, rhodamines, indigoids, quinacridones, diazopyranthrones, dinitroanilines, pyrazoles, diazopyranthrones, dianisidines, pyranthrones,
  • the dyes include, but are not limited to, azo dyes, anthraquinone dyes, xanthene dyes, azine dyes, combinations thereof, and the like.
  • non pigmentary solids may be optionally included, which may include waxes. Examples would include, but are not limited to, calcium carbonate, clays, silicates, silicas, polyolefin and polyamide powders, and talcs. Non pigmentary powders may be present in the range 1-25%.
  • the pigments, fillers and waxes are milled or dispersed to typically less than 10 micrometers with a preferred particle size distribution of 0.2-15 microns, more preferably 0.2-12 microns dependent on application.
  • the pigment dispersion will typically contain 20- 40% pigment, monomer which can be a mono or multifunctional (meth)acrylate monomer, with added stabilizer, inhibitor, dispersant and optionally a pigment additive/synergist and/or a wetting additive/oligomer/resin.
  • the ratio of pigment to dispersant would usually be 1 :2 to 9: 1 depending on the chemistry of the pigment and dispersant.
  • Typical dispersants would include EFKA 7414, 7476, 7477, 7700, 7701, 7702, 7710, 7731 and 7732 available from BASF and SOLSPERSE 1700, 1900, 24000SC/GR, 26000, 32000, 33000, 35000, 36000, 39000, 41000 and 71000 available from Lubrizol.
  • additive/synergists to aid dispersion stability include SOLSPERSE 5000, 12000 and 22000 from Lubrizol.
  • the curing of the inks of the present invention normally requires a traditional mercury vapor discharge lamp to generate UV radiation for initiating the cure of energy curable screen inks.
  • Solid state UV radiation sources such as UV light emitting diodes (LEDs) can also be used as the source of UV radiation.
  • LEDs UV light emitting diodes
  • Mercury lamps also take time to heat up and cool down and have the potential to release mercury, which is highly toxic. UV LEDs can be rapidly switched on and off, are more energy efficient and don't generate heat, so are better for use with heat sensitive substrates.
  • the inks of the present invention could also be formulated to cure by other radiation sources, such as for example microwave, infrared, electron beam, visible light, x-ray, etc.
  • Cyan screen inks were prepared according to the formulations in Table 1, using a rotor-stator (Silverson) mixer.
  • Table 1 Process Cyan Screen Graphic printing ink formulations 1A-1G suitable for printing onto a range of substrates
  • the screen ink printable compositions 1A-1G were printed using a 150T mesh screen onto 240 micron white rigid PVC and cured using a Natgraph, two lamp medium pressure mercury ultra-violet curing unit, with 250 ml/cm 2 per layer exposure.
  • the resulting prints were tested for cross-hatch adhesion according to ISO 2409 and also for pencil hardness, as described in ISO 15184 (2012). The results are displayed below in Table 2.
  • Viscosities of the printing compositions were measured using an REL cone and plate viscometer, large cone speed 2 at 25°C and were found to be in the range 0.9-1.4 Pa s.
  • Pencil hardness 3B ⁇ B ⁇ HB ⁇ H (i.e. H is the hardest result here)
  • Film breaks in places both ink film and substrate shattered.
  • compositions were prepared according to the formulations in Table 6 using a rotor-stator mixer.
  • the viscosities of the resulting inks were measured using a REL cone and plate viscometer large cone speed 2 at 25°C and found all to be in the range from 0.9-1.4 Pa s.
  • the compositions were printed by hand through a 150T mesh on a range of plastic substrates, in single and multiple layers, and ultra-violet cured at 250 mJ/cm 2 per layer on a atgraph curing unit.
  • the adhesion of the inks was assessed using cross hatch ISO 2409 and pencil hardness, as described in ISO 15184 (2012).
  • Pencil hardness 3B ⁇ B ⁇ HB ⁇ F ⁇ H
  • White screen printing compositions were prepared according to the formulations in Table 8. The components were premixed, followed by triple-roll milling until the dispersion grind was less than 10 microns. The resulting inks were measured on a REL cone and plate viscometer with a small cone speed 2 at 25°C. The ink viscosities were measured and found to be all in the range 1.8-2.5 Pa s.
  • Table 8 White screen formulations 3A-3E
  • the white ink formulations from Table 8 were printed using a 140T mesh screen onto clear sheet substrates, polycarbonate, polyester and rigid polyvinyl chloride and ultraviolet cured using a Natgraph unit with 120 W/cm medium pressure mercury lamps.
  • the resulting prints were assessed for cross hatch adhesion using ISO 2409 and also pencil scratch hardness, as described in ISO 15184 (2012).
  • Two sets of prints were produced, on Autostat CT3 100 micron polyester clear sheet, one set with an exposure of 650 mJ/cm 2 and the second with 2000 mJ/cm 2 .
  • the prints were each cut into two parts, one part was aged for a week at 22°C, the other was placed in an environmental chamber (SANYO ATMOS) and the prints stored at 105°C for 7 days.
  • SANYO ATMOS environmental chamber
  • the two sets of prints were assessed for thermal/ultra violet induced yellowing by comparing the room temperature stored prints with the 105°C stored prints using an X-Rite Spectro-Eye photo-spectrometer.
  • the yellowing was measured in terms of a delta E difference average over 5 measurements. The results are recorded in Table 9 below.
  • Thermoforming was conducted using a Clarke vacuum Former 725 FLB model on 240 micron clear rigid PVC prints, which were prepared by printing the formulations White A-E through a 140T screen, cured with 650 mJ/cm 2 on a Natgraph ultra-violet curing unit. The forming was measured using a mold requiring a coating capable of extending 300 per cent. The results of both the adhesion tests and forming are shown in Table 10. The cross hatch tape results are not recorded as all the formulations using the test had perfect adhesion (0) with no removal and therefore the results were non-discriminatory. Table 10: Hardness and thermoforming
  • Forms means that the printed substrate stretches and deforms with no splits or holes in extended ink or substrate.
  • Chips means the ink film splits on extension with gaps, the substrate may or may not be split.
  • the formulation White 3C containing diacetone acrylamide, showed good adhesion and formability, and was slightly softer than formulations White 3A and White 3B when printed on polycarbonate, which are based on White 3A (N-vinyl caprolactam), and White 3B acrylol morpholine.
  • Formulation White 3E is incapable of extension and cracks both the ink and underlying substrate.
  • formulation White 3C is best for retaining whiteness without yellowing on storage of inks or printed parts.
  • White printing compositions were prepared according to the formulations in Table 11. The components were premixed, followed by triple roll milling until the dispersion grind was less than 10 microns. The resulting inks were measured on an REL cone and plate viscometer with a large cone, speed 2 at 25°C. The ink viscosities were measured and found to be in the range 0.6-0.8 Pa s.
  • Example 4 white formulations were printed using a 140T mesh screen on 80 micron gauge top coated polypropylene substrate and cured using a Natgraph unit with medium pressure 120 W/cm lamps. The resulting prints were assessed for cross hatch adhesion using ISO 2409 and the maximum cure speed, as indicated by the minimum energy required to achieve full adhesion (no removal (0)), and the results are recorded above in Table 12. It is to be noted the formulations in Table 1 1 are of suitable rheology to be applied via rotary screen, flexographic or bar coating machines.
  • formulation 4D containing the material diacetone acrylamide has similar cure speed and adhesion to formulation 4A, containing acrylol morpholine (ACMO) and slightly less than the standard formulation 4C containing N-vinylcaprolactam.
  • Formulations 4B and 4E were much slower with poorer adhesion.
  • White printing compositions were prepared according to the formulations in Table 14. The components were high speed mixed using a rotor stator (Silverson mixer) until the dispersion grind was less than 10 microns. The resulting inks were measured on an REL cone and plate viscometer with a large cone, speed 2 at 25°C. The ink viscosities were measured and found to be in the range 0.3-0.4 Pa s.
  • Example 5C and 5E are inventive, Examples 5A, 5B and 5D are comparative.
  • Table 14 White Ink Formulations 5A-5E
  • Example 5 white formulations were hand coated using a yellow coating bar (3-4 microns) on 80 micron gauge top coated polypropylene substrate and cured using a Natgraph unit with medium pressure 120 W/cm lamps.
  • the resulting prints were assessed for cross hatch adhesion using ISO 2409 and the maximum cure speed, as indicated by the minimum energy required to achieve full adhesion (no removal (0)), and no initial surface tack or fingernail scratch.
  • the results were assessed and recorded above in Table 15. It is to be noted that the formulations in Table 14 are of suitable rheology to be applied via flexographic or bar coating machines.
  • Example formulations 5B, 5C, 5E and 5D had good cross-hatch adhesion and surface cure even at 55 mJ/cm2 exposure.

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Abstract

La présente invention concerne une composition d'impression/revêtement durcissable par rayonnement comprenant un matériau acrylamide, de préférence du diacétone acrylamide, qui est très efficace en termes de durcissement rapide, de résistance aux chocs, d'extensibilité, de stabilité thermique/de stockage du point de vue du jaunissement et de l'odeur, laquelle composition est exempte de solvants à base de COV et présente également d'excellentes propriétés d'adhérence.
PCT/US2015/017956 2014-02-28 2015-02-27 Encres et revêtements durcissables par rayonnement contenant du diacétone acrylamide WO2015131029A1 (fr)

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US15/117,066 US20160340529A1 (en) 2014-02-28 2015-02-27 Radiation curable inks and coatings containing diacetone acrylamide

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EP3110893A1 (fr) 2017-01-04
EP3110893B1 (fr) 2020-12-23
WO2015131027A1 (fr) 2015-09-03
US20160340529A1 (en) 2016-11-24
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